Talking about the five characteristics of injection mold


Author: MULAN -Plastic Molding Manufacturer

1. Cavities and cores are three-dimensional plastic parts. The external and internal shapes of the plastic parts are directly formed by the cavity and core. These complex three-dimensional profiles are more difficult to process, especially the molding surface processing in the blind hole of the cavity. If traditional processing methods are used, not only workers are required to have high-level skills, but also many auxiliary tools and fixtures, many tools, and a long processing cycle. 2. High precision and surface quality requirements At present, the surface roughness of general plastic parts is Ra0.2-0.1μm, and the dimensional accuracy requirement is IT6-7. It is required that the injection mold parts have a corresponding surface roughness less than Ra0.1μm, and the size Accuracy to reach IT5-6.

Long-life injection molds are essential to improve efficiency and reduce costs. At present, the service life of injection molds usually requires more than one million tests. In order to prevent the mold from deforming under pressure, precision injection molds need to use rigid mold bases to increase The thickness of the formwork or add support columns or tapered positioning elements. A suitable ejection point should be selected to make the demoulding uniform, and the ejector device is an important factor affecting product deformation and dimensional accuracy. Most high-precision injection molds are inlaid or fully assembled on the structure, so this requires greatly improving the processing accuracy and interchangeability of mold parts.

3. The process takes a long time and the manufacturing time is tight. For injection molded parts, most of them are complete products matched with other parts, and in many cases, other parts have also been completed, so they are eagerly waiting for matching injection molded parts to be put on the market. Due to resin The characteristics of the materials are different, and there are high requirements for the shape or dimensional accuracy of the product. After the mold is manufactured, it is necessary to try and modify the mold repeatedly, which will prolong the development and delivery time is relatively tight. 4. Off-site design and off-site manufacturing The ultimate goal is not mold manufacturing but the final product design proposed by users. Injection mold processing manufacturers design and manufacture molds according to user requirements. In most cases, the injection production of this product is also carried out in other manufacturers, which leads to situations where product design, injection mold design and manufacture, and product production are performed in different places.

5. Dynamic combination, professional division of labor Mold production usually belongs to single-piece production, and the batch size is small, but the mold needs many standard parts, from the mold base to the small thimble, and so on. These cannot be completed by only one manufacturer, and the manufacturing process It is very complicated, and the use of ordinary equipment and CNC equipment is extremely unbalanced.

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